Determination Of The Optimum Design Parameters For A Family Mould

Firdaus Hakimi, Hassan (2010) Determination Of The Optimum Design Parameters For A Family Mould. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

There are various problem have been found in the plastic injection recently. One of the major obstacles is in the mould designing due to lack of understanding of the flow behaviour of plastic mould that resulting in over-packing, short-shot or any other defects on the part. In this project, the idea is to determine optimum design parameters for a family mould by implemented the simulation study using different parameters in the designs made with two different types of level for each parameter. For experiment, two main designs (Design A and Design B) with four different parameters (sprue, runner,gate and cold slug) have been designed by using application of SolidWorks. The seat belt buckle is used as the family mould parts of this study. The approach of Design of Experiment (DOE) was used to define the number of experiment need to conduct. In this work, sixteen experiments have been performed by using Moldflow Plastic Insight (MPI) Analysis software. Three elements of analysis; fill time, deflection and volumetric shrinkage were selected as case study to determine the best design of the family mould.Ranking method was used to determine best design of the experiment analysis. From the analysis result, Experiment 3 was defined as the best family mould design due to its balancing result of filling time, deflection and volumetric shrinkage. Consequently, there are no exact equations describing the relationship between sprue, runner system, gate and cold slug in the mould design and analysis. It depends on many factors such as shape and size of the plastic part, used materials, or the limitation of mould design.

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